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This help desk is a free resource intended for discussion purposes only. Neither BOMA, its chapters, affiliates, or Extreme Measures Inc.® are responsible for the information, comments or opinions expressed herein. For complete information, refer to the official publications of the standards themselves.

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Calculating Square footage.

George Aggett
Visual Solutions Studios Inc.
October 3, 2018

The standard outlines two distinct methods of calculating multi-unit residential buildings. Method A or the “Gross Method” produces a larger area since it measures each unit including the full thickness of the exterior wall and the full thickness of walls separating living units from common areas.


I understand the thickness of the exterior wall and the thickness of interior common walls are included in square footage calculation but the demising wall between the tenants, would only 1/2 the thickness of the wall be calculated for an apartment?

Thank you in advance.

David Fingret
Extreme Measures Inc.
October 4, 2018

A wall that separates one Living Unit from another is split down the middle when using the Gross Method (Method A). However, using the Net Method (Method B), a wall that separates one Living Unit from another is allocated common area.

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